You've asked and we're able to tell you, that with the latest updates our Avira Free Security for macOS is now able to use on macOS 11 Big Sur.
Please take care that you're running the latest Avira version or perform a reinstallation after upgrading to macOS 11.
Note: Avira Antivirus for macOS is EOL (end-of-life) and does not support macOS 11 Big Sur!
Avira Community Manager
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